iwlagn: reduce off channel reception for 4965

Force use of chains B and C (0x6) for Rx for 4965
Avoid A (0x1) because of its off-channel reception on A-band.

Signed-off-by: Rick Farrington <rickdic@hotmail.com>
Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 3ced5e5..7571110 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -563,6 +563,7 @@
 
 
 #define RXON_RX_CHAIN_DRIVER_FORCE_MSK		cpu_to_le16(0x1 << 0)
+#define RXON_RX_CHAIN_DRIVER_FORCE_POS		(0)
 #define RXON_RX_CHAIN_VALID_MSK			cpu_to_le16(0x7 << 1)
 #define RXON_RX_CHAIN_VALID_POS			(1)
 #define RXON_RX_CHAIN_FORCE_SEL_MSK		cpu_to_le16(0x7 << 4)